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The reward for this event is a little hard to find, so I made this video showing the final part of the event (you clear the tower to start the event, it seems? It triggered when we did, but maybe that was a coincidence). Anyway, you gank some 2-star elites, then kill a wave of gobs for 10 mins, then kill the boss. Talk to the captain up top, and the reward is in the basement.
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